Answer:
-9
Step-by-step explanation:
X = -4 + (-5) = -9
You can always move elements of equality to the other side by changing either their signs or applying opposite operator: addition <-> subtraction, multiplication <-> division
x = -9
x - ( - 5 ) = - 4
Distribute the negative sign
x + 5 = -4
Inverse operations;
-5 -5